The Best and Worst Times to Fog Your Yard

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A fogger is a device that repels or kills insects. These devices are mostly used to combat mosquitoes in backyards, gardens, patios, and other areas.

First, you’ll need to find the areas around your house where the mosquitoes are living. The next step is to choose the most effective time for fogging. There are few important things to note about when it’s best to fog and when you should avoid fogging, for safety or efficiency reasons. We’ll go into those reasons below.

When Is the Best Time to Fog?

The best time to fog is when mosquito activity is at its highest. Most mosquitoes are active in the evenings and only a few species are active during the day.

In general, mosquitoes prefer to avoid sunlight and look for shady areas to hide during the day. That’s why the best time for fogging is in the early morning or the evening around dusk. Most fogging is done during the evening for the following reasons:

  • In the evening hours, around dusk, the temperature has lowered. Most of the time, the temperature closer to the ground is going to be higher than that in the air. This will allow the fog from the fogger to settle on the ground more easily. Therefore, the fog will stay in the area for a longer amount of time.
  • At this time of day, the wind has usually died down, which is very important for a successful fogging session.
  • Most good insects like butterflies and bees are active during the day while their activity will have ended before dusk. So, fogging at this time won’t cause as much harm to these good species. This is great since most insecticides will kill not only mosquitoes but also other small bugs and insects that may be beneficial to the area.

The Effects of Wind on Fogging


Avoid fogging in high winds. Doing so can be dangerous for the environment.

It is also important to fog in low wind conditions, while windless conditions would be ideal. Low wind conditions are vital for a successful fogging season because of the size of the fog particles themselves. They are so small that a tiny gust of wind can easily move them.

Having low or no wind will allow the fog to stay in the fogged area for a longer period of time. This will result in more mosquitoes affected by the chemicals and will also repel the mosquitoes from the area for longer.

For example, if you fog a bush in windy conditions, the fog will immediately be blown away from the bush. This will leave only a small number of particles behind to settle in that area. This is why fogging in low wind or windless conditions is vital for achieving fogging success and for exterminating the majority of mosquitoes in an area.

When Is It a Bad Time to Fog?

There also some times when you absolutely shouldn’t use a fogger. As we mentioned above, fogging in windy conditions is not recommended. Fogging in a very strong wind, on the other hand, should absolutely be avoided for the following reasons:

  1. Fogging in a strong wind makes the fogging process ineffective. The insecticide particles won’t be able to reach the area you want to fog. The wind will blow the particles away immediately after they exit the nozzle of the fogger. If you fog in high wind, you’ll be more likely to waste a large amount of insecticide than make a visible impact on the mosquito population in the area you’re treating.
  2. Strong gusts of wind can make fogging uncontrollable and can blow the fog into areas you didn’t plan on fogging. This could be harmful – not only to plants and good insects – but also to children, pets, and even yourself.

Keep Safe While Fogging

Most insecticides contain chemicals which can be bad for your skin. When fogging, remember to protect your skin to keep the fog from getting on it.

Also, if you are fogging in low wind, fog in the direction of the wind. Don’t stand in the crosswind or all the fog will get blown back towards you. Using a fogger in very high temperatures is also not recommended.


Amanda Drew

That’s good to know that windless or low wind conditions are the best times to fog an area because both cold and thermal fogger particles are very small. I’ve got a problem with mosquitoes, and they are always swarming my home and getting into every crack. Everything I’ve tried before hasn’t worked very well, so I’ll have to find someone who’ll come out and use fogging at my house.

Jeremy Thompson

Thanks for the interesting tips on when is the best time to fog! it’s interesting to learn that most mosquitoes are active in the evening. I’ve thought that they were day creatures, I guess I was wrong. I’m glad that you mentioned that in the morning good insects might be affected that’s why it is most advisable to be done in the evening. I’ll do my best to remember your tips and put them into practice.


What’s the best month to do this?


    Thes best time to fog is once mosquitoes become active again in your area. Usually, it is around May. Just make sure that you read the label of the product you are using, since there are products that need to be reapplied every couple of weeks to a month, and then there are some that will work for several months.


    Ok great, thanks!

Robert Parker

What about rain? This summer 2018 in Atlanta has been a very rainy season. Rarely a day goes by without a shower of some kind. Should I wait until there are several dry condition days ahead to fog? Can I fog on an evening when it HAD earlier been raining during the day w/ the ground, trees & shrubs still wet?
Any general rules of thumb? How much does it matter?


    It really depends on the product you use. Fogging in dry, windless conditions is preferable since most fogging solutions, especially those more long lasting ones, do need time to dry and bond with the surface that the solution is applied to. But I’d say that as long as the fogging solution is allowed to dry for about 30 minutes (or however long it is indicated on the label), the area should still be protected even after rain.

Ediae O William

Good thanks.

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